The Columbia River Basin Land Ownership coverage depicts land ownership for all lands in the US portion of the Columbia River Basin. Additional management information is maintained where it was available. The coverage was compiled from GAP state projects' land stewardship data. The attribute coding system is consistent with that developed by GAP. However, many states did not use the GAP coding system when they developed their data and new codes, not published in the GAP Handbook, had to be added to this coverage to successfully recode these states' data. These data contain a three level, hierarchical coding system. Level1 attributes are coarsest including only 9 categories such as Federal, State, etc..., ownership. Level2 attributes provide more detail such as the name of the agency. For example, Bureau of Land Management, National Park Service within the Level1 Federal government class. Level3 provides additional information on how the land is managed. All states are not mapped to the same detail level due to the varying methodologies and quality of the input GAP state data sets. The data is 1:100,000 scale and includes portions of ID, MT, NV, OR, UT, WA ,WY.

Purpose:

Created for the Subbasin Planning portion of the Northwest Power Planning Council's (NWPPC) Fish and Wildlife 2000 program.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19950615

Ending_Date: 19990831

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -124.431101

East_Bounding_Coordinate: -109.028248

North_Bounding_Coordinate: 49.061163

South_Bounding_Coordinate: 40.903399

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: ownership

Theme_Keyword: management

Theme_Keyword: stewardship

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Columbia River Basin

Place_Keyword: USA

Access_Constraints:

Free on-line registration and login required. Must accept Terms of Use stated on NHI web site <http://www.nwhi.org>.

Use_Constraints:

Copyright. Redistribution prohibited. Use in publications requires citation as described in NHI Terms of Use statement.

Attributes are as accurate as original source data at their time of publication. Ownership and management may have changed over time. LEVEL1 attributes (coarsest) and LEVEL2 attributes (medium detail) are more consistently mapped throughout the basin than LEVEL3 (finest) attributes as some states mapped more detail than others. No accuracy assessment performed.

Logical_Consistency_Report:

Polygon topology built and verified. All polygons have one label and all polygons are attributed.

Completeness_Report:

Data set is complete for the geographic areas covered: Columbia River Basin - US portion.

The original GAP datasets did not align along state boundaries, and additionally, the polygons were not edgematched. To join these datasets, all coverages were projected to the current Albers projection. Next, a coverage for each state was created so that each contained only the item LEVEL3CODE, the finest level of the coding system. The LEVEL3CODE was determined by incorporating all of the available ownership and management attributes for each state. Polygon topology was verified and corrected as necessary. The coverages were then appended and topology rebuilt with the ArcInfo Clean command. Newly created polygons along state boundaries with a LEVEL3CODE value of 0 were then Eliminated since they were artifacts of the state boundaries misalignment. The coverage was then dissolved on PROTSTAT to delete the boundaries between like attributed polygons across state borders. The additional attributes (LEVEL1CODE, LEVEL1NAME, LEVEL2CODE, LEVEL2NAME, and LEVEL3NAME) were subsequently joined from a look-up-table and the coverage was clipped to the US Columbia River Basin boundary.

Please note that due to time and funding constraints, the newly added (non-GAP) codes do not perfectly nest hierarchically. The codes were added as each state was processed without changing any of the GAP stated codes. These data could be improved by creating a new hierarchical system (it would have to alter the structure of the GAP system slightly) and recoding the data. Additionally, if a new coding system were adopted, the original data should be re-evaluated one more time to ensure classification accuracy as some of the earlier classified states may have polygons that could be more accurately classified by classes that were added later in NHI's coding process.

See Excel spreadsheet (crb_owner.xls) for all GAP and added codes used in this coverage.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Northwest Habitat Institute

Contact_Person: Charley Barrett

Contact_Position: Information Systems Director

Contact_Address:

Address_Type: mailing address

Address: PO Box 855

City: Corvallis

State_or_Province: OR

Postal_Code: 97339

Country: USA

Contact_Voice_Telephone: 541-753-2199

Contact_Facsimile_Telephone: 541-753-2440

Contact_Electronic_Mail_Address: charleyb@nwhi.org

Contact_Electronic_Mail_Address: habitat@nwhi.org

Hours_of_Service: 9:00 AM to 5:00PM PST M-F

Contact_Instructions: Email preferred.

Resource_Description: US Columbia River Basin Land Ownership (crb_lowner.zip)

Distribution_Liability:

The information depicted in this GIS layer is the result of digital analyses performed on data from a variety of governmental and other credible sources. The accuracy of the information presented is limited to the collective accuracy of the data on the date of the analysis. The information is believed accurate and reasonable efforts have been made to ensure the accuracy of the data. However, the Northwest Habitat Institute expressly disclaims responsibility for damages or liability that may arise from use of this data. This product is the property of the Northwest Habitat Institute and its use is thereby restricted.